Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hieu van » hieu va, thien van, lieu va
hanh lam » thanh lap, hanh kem, hanh va
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty hang, ly nang
van bac » van ban, van bao, van hac
va hanh » van hanh, va thanh, va danh
xuc va » duc va, tuc va, luc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty nang) OR (ty xang)) xa hoi. hieu van bac xuc va hanh lam ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) xa hoi. hieu van bac xuc va hanh lam ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty xang)) xa hoi. hieu van bac xuc va hanh lam ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty xang)) xa hoi. hieu van bac xuc va hanh lam ((cua triet) or (cua viet))*.